Reenforced concrete bridge



Jima 17, 1930. B. BAUER REENFoRcED CONCRETE BRIDGE Filed sept. 22. 1927 2v sheets-sheet. 1

m @u fff o f. .Q El, m o o -g D -fff Q r .Q I .a Q Q, Tg, v a: l /y ",y ",y

June 17, 130. 1 B. BAUER REENFRCED CONCRETE BRIDGE Filed Sept. 22, 1927 2 Sheeias-Sheet 2 Fig/Jl..

BRU/vo BA UER luv Av1-1. Y

` -bersby ineans ofthe so-called American erect- `ingjinethods. f' If a light bridgingfha's been l shells. f s i' 10;

n l`iippiimatiim inea september 22,192?, serisi @ne 'z2 .l I

f fl-leretofore reeniorced concrete bridges of a inedium span onlycould enter into economi- @cal .competition withiron bridges. In the; r-'case of larger'spansgthe costs of building reen'forced concrete bridges were excessively increasedin consequence of Vthe increased weight'and the necessity. of erectingin the river, .sea or watera scaffold carrying the This invention la`i`e`nioi`inted on the two shoresand which are e 'g subsequently folded togetherv about` a hinge ea'pacity than would correspond tothe dead'v v weight of the unnecessary cast iron cores ior part of the arch together'with the vweight f ofthe'worknienand their tools. Y f Inithe eik/'ent of larger spans, an arch of and which does not requirefa larger carrying thiskindcan be made also of individual mein-` niade in this way, completely' finished `archcores of braced cast ironare yput ytogetherzin Y 'f gether are connected with Yone another, wherei Vaby-their ycarrying capacity increases in ac- `cordance with the increasing erectionof such individual arches. A Y i lIn all known si'inilar bridge-constructions,

l arch-supports consisting of a heavy riveted iron-construction were employed, which subsequently were also`v imbedded in concrete, -gwhile according Ato the presentY invention `inv'entrenl are illustrated fby way or' .example ,jf

relates to a method of buildi' ling or erecting reenforced"concretebridges,

v according to whichnot onlythedead Weight of thefarches of the bridge is reducedv consid,I e'rably but also theV erection of expensive scaffolds andv shells isrendered unnecessary;r This fobject is attained in that'the standardized 1bridge-archesare divided into sections which, vrfduringthe erection, 'form independent Aunits and render possible the erectionof the bridge iin such a. manner, that owing to the manufacture of the individualparts'of thearcho'ne ater'the other, the carrying capacity of the "bridge is increased gradually. The method according` to the present invention is carried -r`'out for instance in such a manner,` that a light bridging is at first built which consists y ofa light iron-structure, the halves of which i ironcoreshown in Fig. 1,1 and i struction ofafcast iron core,which'isenlarge nonev directiong.and..p` i

Vstantiallyrectangularshaped core shown in cross-section respiectively;inemloers.y usedV 'as curve d core,V consists of: two'` separate braced is?` i VAcast iron cores e `and,f,lwhichare reta-inedand `connected with', [one another in properl v s Y vvenientmanner. individual arches, which after the -iitting to- Fig.10 the cores areconstructed according to y Y VFifSfand'5f 1 i dratving l' wh f ne shows Y l, ewalbracedcylindric cast. iron. core provided with downwardly di,- rectedstraps-forfattachingtheshell.,v.v 'y F is. 2 illustratesfin' crosslsection the Vcasteil Y Y Figg is the sdevie'wfoi" a sleeve-shaped f connecting wedge; v l i ;Y Fig. 4 showsinfside view a modified? on Fig. 4. c

Figs .6and17 illustrate' in sidevi'ewand 70"* curved cores. s y.

Fig 8 *shows in elevation and cross#sectionl t, Y respectively connecting wedgesfused in` con*v nection Withifthe coresshown in Figs-6 'andi-7. Figs. 19 vand 101- illustrate in=-crosssection reenforc'ed concrete `*bridges according` tothe *n i present invention. j n Fig. .lllisa planviewof afraginen-t of a- In Figs lgand .2, olffde'signatesfthedown wardly directed straps oft ie core for' thel a tachinent ofithe fsliell.v EN; I d, A In .'Figs. 6 and l 7 leachineniber, useda's spaced-end toend relationby nieans of rot g andrwedgesor rings It in v,any other lcon Y In F cores fareeniployedi according to Figs(6317;V l, and8,` while in the constructionillustrated yin e5l In vthe case ofnarched bridges; braced cast, y yV ironand the usual round iron protection`and, 4 Y. asin thecase o'ffother yconcretebridges, shell-y y" scaflolds hadto'bejeniployed, whileaccording tothe 'presentinvention'the*l brace'd cast iro members can be encased in sheet iron shells,

which are supplied in conjunction with the cast, iron and permit concreting. The cast iron members maybe provided vWith extensions for guiding the'shells, so that the fmishedbridge is in the shape ofa reenforced concrete member containing braced cast iron and compared 'With a solidY concrete arch Vis comparatively light in Weight, as an iron'reenforcement is imbedded in the usual man-v ner.

I claimv In reenorced concrete bridge construction, a core for the concrete, said core comprising an independent supporting arch acting as such, and consisting of a plurality of preformed metallic pressure resistant rods, each Wrappedin bracing Wire and means for retaining said plurality of Vrods together in properly spaced end to endrelation.

In testimony whereof I afix my signature.

` DR. BRUNO BAUER. 

